Evaluation Metrics. Although our task is 3D-MPE at camera-centric coordinates, we also perform person-centric 3D-MPE evaluation metrics. We use Percentage of Correct 3D Keypoints(\(\text{PCK}\) ) to evaluate the performance of 3D-MPE on MuPoTS-3D, which calculate the percentage of correct joints if it lies within 15cm from the ground truth joint location. Following [1]}, We report the relative 3D\(\text{PCK}_\text{rel}\)  that with root alignment to evaluate the person-centric 3D-MPE, and absolute 3D\(\text{PCK}_\text{abs}\)  that without root alignment to evaluate the camera-centric 3D-MPE. To compare the human depth location ability, we evaluate \(\text{PCK}_\text{root}\)  that only measures the accuracy of root joints and percentage of correct ordinal depth (PCOD) that measures the accuracy of ordinal depth following [2]}.
